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graphics: Handle non-well-formatted rectangle at DrawImageOptions

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This commit is contained in:
Hajime Hoshi 2017-12-14 11:52:11 +09:00
parent 7378192fc2
commit 4744b461df
2 changed files with 18 additions and 14 deletions
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30
image_test.go
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@ -628,25 +628,29 @@ func TestImageOutside(t *testing.T) {
src.Fill(color.RGBA{0xff, 0, 0, 0xff})
cases := []struct {
X, Y int
X, Y, Width, Height int
}{
{-4, -4},
{5, 0},
{0, 10},
{5, 10},
{8, 0},
{0, 16},
{8, 16},
{8, -4},
{-4, 16},
{-4, -4, 4, 4},
{5, 0, 4, 4},
{0, 10, 4, 4},
{5, 10, 4, 4},
{8, 0, 4, 4},
{0, 16, 4, 4},
{8, 16, 4, 4},
{8, -4, 4, 4},
{-4, 16, 4, 4},
{5, 10, 0, 0},
{5, 10, -2, -2}, // non-well-formed rectangle
}
for _, c := range cases {
dst.Clear()
op := &DrawImageOptions{}
op.GeoM.Translate(0, 0)
r := image.Rect(c.X, c.Y, c.X+4, c.Y+4)
op.SourceRect = &r
op.SourceRect = &image.Rectangle{
Min: image.Pt(c.X, c.Y),
Max: image.Pt(c.X+c.Width, c.Y+c.Height),
}
dst.DrawImage(src, op)
for j := 0; j < 4; j++ {
@ -654,7 +658,7 @@ func TestImageOutside(t *testing.T) {
got := color.RGBAModel.Convert(dst.At(i, j)).(color.RGBA)
want := color.RGBA{0, 0, 0, 0}
if got != want {
t.Errorf("src(%d, %d), dst At(%d, %d): got %#v, want: %#v", c.X, c.Y, i, j, got, want)
t.Errorf("src(x: %d, y: %d, w: %d, h: %d), dst At(%d, %d): got %#v, want: %#v", c.X, c.Y, c.Width, c.Height, i, j, got, want)
}
}
}

2
vertices.go
View File

@ -44,7 +44,7 @@ func (v *verticesBackend) get() []float32 {
}
func vertices(sx0, sy0, sx1, sy1 int, width, height int, geo *affine.GeoM) []float32 {
if sx0 == sx1 || sy0 == sy1 {
if sx0 >= sx1 || sy0 >= sy1 {
return nil
}
// TODO: This function should be in graphics package?